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predator 212 with .36 jet, 140 etube, and exhaust... I've lost 5 mph at my top end and back fires like crazy at full throttle... will the high flo intake take care it? if not what is the cause? at the top end of throttle it feels like it still has more to go but like I said starts back firing...

I have a thunder cart and would like to know how to get a let more out of it... how much will tire size effect speed? how much bigger should I go? I'm at 13x5 on the rear...

I had a frame given to me... it's a 1 wheel drive... I've sanded it, repainted and added a predator 212 to it... I've started to mod the motor... exhaust, jet, and intake should be in Tuesday. it runs 40.65 mph and was wondering if I can get anything else out of it. it's a small tire kart...